Abstract:

As a complicated fault-block reservoir, Shen 84-An 12 block in Damintun Depression of Liaohe Oilfield, has been at the late stage of development with high water content.Based on the drilling and logging data, and with the basic principles of high resolution sequence stratigraphy, the authors identified and compared base level cycles for Es33 semi-member of Shen 84-An12 block.It was analyzed that the base level cycles could control the sedimentary characteristics, reservoir properties and the distribution of residual oil.Then it was made sure that  residual oil had different enrichment features at different parts of the base level cycles, and they were: (1) late stage of base-level-dropping and early stage of base-level-rising, sand body has wide area, large thickness and good reservoir properties, and widely distributing residual oil is easy to develope; (2) early stage of base-level-dropping and late stage of base-level-rising，sand body has small area, little thickness, poor reservoir properties, and scattered residual oil is difficult to develope; (3) middle stage of base-level-dropping or rising, residual oil reserves is medium.So, the applications of highresolution sequence stratigraphy, are very useful in development of residual oil in the high water content stage.

Key words: Damintun Depression, high resolution sequence stratigraphy, base level cycle, residual oil